HomeBelts and Cooling > SwitchesStandard Ignition TS-378 Engine Cooling Fan Switch
Part #: TS-378

Standard Ignition TS-378 Engine Cooling Fan Switch

⚙️ 32 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Chevrolet, Toyota, and Geo, Prizm, Corolla, Paseo, Tercel, and Celica
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Reliable Engine Cooling Fan Switch for Chevrolet, Geo, and Toyota

The Standard Ignition TS-378 Engine Cooling Fan Switch is designed to maintain optimal engine temperature by controlling the cooling fan operation. Compatible with select Chevrolet, Geo, and Toyota models, this switch ensures efficient engine cooling and helps prevent overheating.

  • Attachment Method: Plug in for straightforward installation
  • Connector: Female, square shape with one connector
  • Terminal: Single male blade terminal for secure electrical connection
  • Thread Size: 16mm x 1.50 for precise fitment
  • Voltage: 12 volts, suitable for standard automotive electrical systems
  • Housing Material: Durable metal construction with brass finish
  • Switch Actuation Style: Toggle, opens at idle to regulate fan operation
  • Compact dimensions: 0.51 inches (12.954 mm) width

Detailed Product Description

The Standard Ignition TS-378 Engine Cooling Fan Switch features a robust metal housing with a brass finish, providing durability and corrosion resistance. Its plug-in attachment method and square female connector simplify installation and ensure a reliable electrical connection. Designed to open at idle, this toggle-style switch helps regulate the engine cooling fan, preventing unnecessary fan operation and reducing wear. The single male blade terminal and 16mm x 1.50 thread size make it compatible with specific Chevrolet, Geo, and Toyota vehicles, including the Celica, Corolla, Paseo, Prizm, and Tercel models.

Common Applications and Issues Addressed

  • Prevents engine overheating by activating the cooling fan at the correct temperature
  • Resolves intermittent fan operation caused by faulty switches
  • Eliminates electrical connection issues with a secure plug-in design
  • Helps maintain consistent engine temperature for improved performance
  • Replaces worn or damaged cooling fan switches in compatible vehicles

Installation Notes and Tips

  • Ensure the engine is cool before beginning installation to avoid burns
  • Verify thread size (16mm x 1.50) matches the vehicle’s mounting point
  • Disconnect the battery to prevent electrical shorts during installation
  • Use appropriate tools to avoid damaging the switch or connector
  • Check for proper fan operation after installation to confirm correct switch function

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The TS-378 Engine Cooling Fan Switch undergoes rigorous quality control testing to provide consistent operation. While specific warranty details may vary, Standard Ignition typically offers coverage against defects in materials and workmanship to support long-term use.

BrandStandard Ignition
Part NumberTS-378
ColorWhite
Connector GenderFemale
FinishBrass
Terminal TypeBlade

This part fits 32 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2000ChevroletPrizmN/A
1999ChevroletPrizmN/A
1999ToyotaCorollaN/A
1999ToyotaPaseoN/A
1999ToyotaTercelN/A
1998ChevroletPrizmN/A
1998ToyotaCorollaN/A
1998ToyotaPaseoN/A
1998ToyotaTercelN/A
1997GeoPrizmN/A
1997ToyotaCelica1.8LL4N/A
1997ToyotaCorollaN/A
1997ToyotaPaseoN/A
1997ToyotaTercelN/A
1996GeoPrizmN/A
1996ToyotaCelica1.8LL4N/A
1996ToyotaCorollaN/A
1996ToyotaPaseoN/A1 Term.
1996ToyotaTercelN/A
1995GeoPrizmN/A
1995ToyotaCelica1.8LL4N/AOn Water Inlet
1995ToyotaCorollaN/A
1995ToyotaPaseoN/A1 Term.
1995ToyotaTercelN/A
1994GeoPrizmN/A
1994ToyotaCelica1.8LL4N/AOn Water Inlet
1994ToyotaCorollaN/A
1994ToyotaPaseoN/A1 Term.
1994ToyotaTercelN/A
1993GeoPrizmN/A
1993ToyotaCelica1.6LL4N/AOn Water Inlet
1993ToyotaPaseoN/A1 Term.

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

15-5015517-10481S449120014201-172053-139008553871894281215094853091FS122MT0549RF82SW653TFS23V70-99-0008

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.